I use many of the ones people have mentioned here, but in Firefox. Can't switch to Chrome because it doesn't have a good implementation of two of my favorite ad

I use many of the ones people have mentioned here, but in Firefox. Can't switch to Chrome because it doesn't have a good implementation of two of my favorite add-ons: Stumbleupon - for whenever I need a distraction that even HN can't fullfil Colorzilla - For getting colors of web pages; use this about a dozen times a day